Nanoscale,
Journal Year:
2023,
Volume and Issue:
15(27), P. 11667 - 11680
Published: Jan. 1, 2023
Surface
contamination
of
materials
by
nitrogenous
impurities
is
a
major
problem
that
can
bias
the
quantification
ammonia
in
photocatalytic
N2
fixation
reactions.
In
this
work,
SrTiO3
nanocubes
were
prepared
using
precursor
and
engineered
with
Ti3+
sites
oxygen
vacancy
defects
one-step
solvothermal
approach.
It
was
observed
synthesized
containing
surface
therefore
rigorous
cleaning
procedure
adopted
to
eliminate
them
best
extent.
The
contribution
unavoidable
deduced
form
adventitious
NH3
employing
control
experiments
realistic
generation
achieved.
found
pristine
showed
no
activity,
whereas
one
defected
highest
formation
under
natural
sunlight
pure
water,
which
ascribed
tuned
defect
sites,
enhanced
area
efficient
separation
photogenerated
charges.
Based
on
experimental
results,
stringent
protocol
has
been
suggested
for
synthesis
while
working
precursors
subsequent
experiments.
Thus,
present
study
provides
simple
affordable
catalyst
studied
application
expands
scope
perovskite
oxide
fabricate
photocatalysts
sustainable
production.
Ultrasonics Sonochemistry,
Journal Year:
2023,
Volume and Issue:
100, P. 106616 - 106616
Published: Sept. 23, 2023
A
novel
heterojunction
composite
of
CoOx/Bi4Ti3O12
was
synthesized
through
a
combination
molten
salt
and
photodeposition
methods.
The
optimal
sample
exhibited
superior
performance
in
the
piezocatalytic
degradation
methyl
orange
(MO)
dye
with
rate
1.09
h−1,
which
2.4
times
higher
than
that
pristine
Bi4Ti3O12.
Various
characterizations
were
conducted
to
reveal
fundamental
nature
accountable
for
outstanding
CoOx/Bi4Ti3O12.
investigation
band
structure
indicated
formed
type-I
p-n
structure,
CoOx
acting
as
hole
trapper
effectively
separate
transfer
piezogenerated
carriers.
Significantly,
MO
best
further
increased
2.96
h−1
under
combined
ultrasonic
vibration
simulated
sunlight.
synergy
between
piezocatalysis
photocatalysis
can
be
ascribed
following
factors.
photoexcitation
process
ensures
sufficient
generation
charge
carriers
CoOx/Bi4Ti3O12,
while
piezoelectric
field
within
Bi4Ti3O12
promotes
separation
electron-hole
pairs
bulk
phase.
Furthermore,
significantly
facilitates
surface
This
involvement
free
electrons
holes
reaction
leads
remarkable
enhancement
catalytic
degradation.
work
contributes
understanding
coupling
mechanism
effect
photocatalysis,
also
provides
promising
strategy
development
efficient
catalysts
wastewater
treatment.
ACS Applied Nano Materials,
Journal Year:
2023,
Volume and Issue:
6(17), P. 15709 - 15720
Published: Aug. 29, 2023
In
this
study,
a
Bi4O5Br2/CdWO4
(BOB/CWO)
composite
photocatalyst
was
designed
and
prepared
using
convenient
hydrothermal
method.
A
detailed
investigation
carried
out
on
the
morphology,
specific
surface
area,
structure,
optical
properties,
photoelectric
chemical
properties
of
BOB/CWO
composite.
The
CdWO4
nanorods
were
found
to
disperse
Bi4O5Br2
nanoflowers,
their
tight
contact
between
resulted
in
formation
heterojunction
structure.
By
analysis
band
structure
two
semiconductors,
it
that
worked
type
II
mechanism,
effectively
improving
separation
efficiency
electron–hole
pairs.
Therefore,
exhibited
high
performance
photocatalytic
N2
fixation
(PNF)
reactions.
optimal
catalyst
presents
PNF
rate
501
μmol
L–1
g–1
h–1
under
simulated
sunlight
irradiation,
which
5.7
3.1
times
pure
Bi4O5Br2,
respectively.
Under
visible-light
illumination,
sensitized
coupling
effect
boosting
reaction
could
still
be
observed.
findings
study
are
anticipated
offer
practical
knowledge
about
design
synthesis
efficient
photocatalysts
for
PNF.
ACS Catalysis,
Journal Year:
2024,
Volume and Issue:
14(8), P. 6292 - 6304
Published: April 10, 2024
Photocatalytic
nitrogen
reduction
reaction
(pNRR)
is
considered
an
ideal
NH3
synthetic
technology.
Although
catalysts
prepared
for
pNRR
under
mild
conditions
have
been
extensively
developed,
they
still
face
limitations
of
insufficient
N2
adsorption/activation
and
low
selectivity.
Herein,
a
MoS2/In–Bi2MOO6
heterojunction
catalyst
with
interfacial
chemical
bond
was
constructed
by
the
electrostatic
self-assembly
method.
Efficient
spatial
separation
photogenerated
electron/hole
pairs
accelerated
carrier
transfer
dynamics
were
facilitated
due
to
formation
Mo–S
at
interface
between
MoS2
In–Bi2MoO6.
The
crystal
orbital
Hamiltonian
population
(COHP)
analysis
further
confirmed
that
electrons
transferred
from
into
antibonding
activate
adsorbed
N2,
favoring
nitrogen-to-ammonia
(N2-to-NH3)
conversion.
resultant
NH3/NH4+
production
rate
3%
MoS2/In–Bi2MoO6
reached
90
μmol·g–1·h–1,
representing
significant
improvement
over
pure
Bi2MoO6,
while
NO3–
minimal.
Introducing
as
cocatalyst
effectively
inhibited
oxidation
NO3–,
achieving
selective
pNRR.
This
work
provides
foundation
photocatalytic
fixation,
offering
valuable
insights
clean
NH3.
